Fire-extinguisher.



I. M. JOHNSON.

FIRE EXTINGUISHER.

APPUCATION {ILED SEPT. 21

Patented May 9,1916.

INVENTOR. .jfirz /7[. Joimmrz,

WITNESSES:

A TTORNEV.

UNITED STATES PATENT OFFICE.

JOHN M. JOHNSON, OF KANSAS CITY, MISSOURI, ASSIGNOR TO THE UNITED STATES AUTOMATIC FIRE ALARM COMPANY, A CORPORATION OF MISSOURI.

FIRE-EXTINGUISHER.

Specification of Letters Yatcnt.

Patented May 9, 1916.

Application filed September 21, 1914. Serial No. 862,703.

guish a fire in the incipient stage, so that the great damage to which merchandise is sometimes subjected by an unlimited supply of water discharged through sprinkling systems connected to city mains, is avoided.

In the preferred use of the invention, the desired number of fire-extinguishers are located adjacent the ceilings of the building to be protected, and are connected to circuits controlled by a like number of thermostats, or the like, which. on being subjected to a certain temperature close the circuits through their respective fire-extinguishers only, so that only those in the immediate vicinity of the tire will discharge their liquid contents.

In order that the invention may be fully understood. reference will now be made to me accompanying drawings, in which:

Figure l is a vertical section of the firecxtinguisher taken on line 1-1 of Fig. 2. Fig. 2 is a broken plan view of the fire-extinguisher. Fig. 3 is a horizontal section taken on line IIIIII of Fig. 1. Fig. 4 is a broken elevation of a bottle and its holder. forming part of the invention.

In carrying out the invention, I employ a receptacle 1 constructed, preferably, of copper or other noncorrosive material and adapted to hold a liquid compound of water and bi-carbonatc of soda, or other Suitahle chemical element of high efficiency in extinguishing fires. The upper end of the receptacle 1, is threaded and screwed upon a circular head 2 having an upper marginal flange 3. so that the fire-extinguisher may be suspended from a suitable support. for instance. as the ceiling of a room.

I designates a tubular holder having a longitudinal slit 5 to render it resilient, so that it will firmly grip a bottle 6 when inscrtcd therein as disclosed by Fig. l,

The hottlc (3 is of fragile material such.

for instance. as glass and has an attenuated lower end 7 which may be readily broken to discharge the contents of said bottle, as will hereinafter appear. The upper end of the bottle 6 is open, so that it may be filled with an acid which on becoming liberated from the bottle, intermixes with the liquid compound and creates suflicient pressure to force said liquid through a siphon 8, the long leg of ivliiclrextends outward through the bottom of the receptacle 1 and communicates with a spray nozzle 9. After the bottle 6 is supplied with the chemical element, said bottle is hermetically sealed with wax or other suitable material 10, to preserve the chemical element therein until used.

11 designates a blade adapted to swing in the direction of the arrow (1 (Fig. 3) and sever the attenuated end 7 of the bottle 6. Said blade 11 is fixedly mounted upon the lower end of a shaft 12 journaled in bearings 13 and provided at its upper end with a trigger 14, normally held in engagement with the end of an armature 15, controlled by an electromagnet 16, mounted upon an arm 17 within the head 2. The armature 15 is normally held away from the adjacent poles of the electromagnet and a contact 18 by means of a spring 19.

20 designates a retractile spring fastened at-one end to the trigger I4 and at its opposite end to an eye 21 secured inside of the head 2.

Operation: When the electromagnet 16 is energized the armature 15 moves toward the contact 18, and passes out of the path of the trigger 14, which is instantly drawn into engagement with its stop 14- by the spring 20. This movement of the trigger 14, causes the blade 16 to'swee through and sever. the attenuated end 7 o the bottle 6, thus freeing the chemical element within said bottle, which element upon mixing with the liquid in the receptacle 1 creates sufficient pressure to force the liquid through the siphon 8 and the spray nozzle 9. The holder 4 may be supplied with another bottle of acid, and the receptacle L can be recharged after it has been unscrewed from its respective head 2..

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

fire extinguisher consisting of a circular head having an upper marginal flange, a receptacle removably secured to said head,

a siphon wholly arranged within said receptacle and having one leg projecting through the bottom of said receptacle, a nozzle secured to the projecting end of the siphon, a split holder depending fro n the head into the receptacle to hold a bottle a blade to sever the bottle, a shaft upon which said blade is fixedlymounted, a bearing in"tlie head in which said shaft is journaled, a trig- 10 ger fixed to the upper end of the shaft, a

spring secured to said trigger and the head to automatically actuate said trigger, an armature to normally hold the trigger against the action of said spring, and magnetic means for drawing said armature out of the path of the trigger, substantially as shown and described.

In testimony where If I afiix my signature, in the presence of '0 witnesses.

JOHN M. JOHNSON. Witnessesi- F. G. FISCHER,

L. J. FISCHER. 

